//
// Created by Castle on 2025/10/28.
//

#include <iostream>
using namespace std;

int main() {
    // 大写转小写
    char ch;
    cin >> ch;
    if (ch >= 'A' && ch <= 'Z') {
        ch = ch + 32;
        cout << ch;
    }else {
        cout << ch;
    }

    return 0;
}